The STEN is a British-made light submachine gun that was used extensively during World War II. It was designed in 1940 and was made from stamped and welded sheet metal, making it relatively inexpensive to produce. The STEN was a reliable and effective weapon, and it saw service with British and Commonwealth forces throughout the war. It was also used by resistance fighters in occupied Europe. The STEN was eventually replaced by more modern weapons, but it remains an iconic symbol of the conflict.